CN108500076A - A kind of device and method accurately controlling aluminium section hot-extrusion die local temperature - Google Patents
A kind of device and method accurately controlling aluminium section hot-extrusion die local temperature Download PDFInfo
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- CN108500076A CN108500076A CN201810495065.6A CN201810495065A CN108500076A CN 108500076 A CN108500076 A CN 108500076A CN 201810495065 A CN201810495065 A CN 201810495065A CN 108500076 A CN108500076 A CN 108500076A
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- liquid nitrogen
- mold
- temperature
- die
- control valve
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C29/00—Cooling or heating work or parts of the extrusion press; Gas treatment of work
- B21C29/04—Cooling or heating of press heads, dies or mandrels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C29/00—Cooling or heating work or parts of the extrusion press; Gas treatment of work
- B21C29/003—Cooling or heating of work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C31/00—Control devices, e.g. for regulating the pressing speed or temperature of metal; Measuring devices, e.g. for temperature of metal, combined with or specially adapted for use in connection with extrusion presses
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Of Metal (AREA)
- Mounting, Exchange, And Manufacturing Of Dies (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The present invention provides a kind of device accurately controlling aluminium section hot-extrusion die local temperature, including liquid nitrogen container, low temperature control valve, liquid nitrogen pipes, die-cushion, mold and temperature controller, the mold is mounted in die-cushion, the liquid nitrogen pipes are connected between liquid nitrogen container and die-cushion and for conveying liquid nitrogen into die-cushion, the low temperature control valve is set in liquid nitrogen pipes and controls liquid nitrogen flow, contact thermocouple is equipped in the mold, the contact thermocouple is connected with temperature controller by compensating wire, the temperature controller is electrically connected with low temperature control valve and controls signal to low temperature control valve conveying direct current.The present invention also proposes a kind of method accurately controlling aluminium section hot-extrusion die local temperature, by direct Measurement die temperature feedback signal is provided to low temperature liquid nitrogen control valve, to accurately control the temperature of mold, the variation hysteresis quality and inconsistency of press exit proximate matter high temperature and mold temperature in aluminium extrusion process are overcome.
Description
Technical field
The present invention relates to the technical fields more particularly to one kind of aluminium section bar production equipment and technique accurately controlling aluminium section bar heat
The device and method of extrusion die local temperature.
Background technology
Aluminium profile product is to enable aluminum alloy to material by the method for hot extrusion by the mold of specific structure form to be extruded
It is molding.Due to being worked under conditions of high temperature and pressure height rubs, the work band of mold often because of local temperature not
It is disconnected to increase and wear and be easiest to fail, decline so as to cause Surface of profile quality, dimension overproof, or even mold is caused to scrap
Problem.Based on problem above, there are two existing solution is main：First, reducing aluminium alloy using lower extrusion speed
The accumulation of deformation heat and frictional heat in extrusion process used for forming avoids result in the lasting raising of mold part (work band) temperature；
Second is that using liquid nitrogen cooling technology, this method is to introduce liquid nitrogen in groove special on die-cushion by additional pipeline, liquid nitrogen
By thermal evaporation heat absorption, to the mold temperature for reducing die-cushion and being in close contact with die-cushion, the supply of liquid nitrogen is by Subzero valve
Control, preferable control technology are to export installation infrared thermometer in press, and the surface temperature of aluminium section bar is squeezed out by measurement,
It feeds back to the low temperature valve that can automatically adjust valve aperture and then controls the supply of liquid nitrogen, this method is to be extruded due to temperature measuring point
Aluminium section bar, and the non-required mold for directly controlling cooling, and the temperature of practical upper sectional material and the temperature of mold do not have sternly
The consistency of lattice, thus in this method liquid nitrogen to the control of mold temperature and inaccurate, sometimes because both temperature change it is stagnant
Property causes the control signal of temperature feedback to play opposite effect to liquid nitrogen cooling afterwards.
Invention content
The purpose of the present invention is to provide a kind of device and method accurately controlling aluminium section hot-extrusion die local temperature,
The temperature that aluminium section hot-extrusion die can be accurately controlled overcomes press exit proximate matter high temperature and mold temperature in aluminium extrusion process
The variation hysteresis quality and inconsistency of degree.
In order to achieve the above object, the present invention adopts the following technical scheme that：One kind accurately controlling aluminium section hot-extrusion die
The device of local temperature, including liquid nitrogen container, low temperature control valve, liquid nitrogen pipes, die-cushion, mold and temperature controller, the mold installation
In die-cushion, the liquid nitrogen pipes are connected between liquid nitrogen container and die-cushion and for conveying liquid nitrogen, the low temperature control into die-cushion
Valve processed is set in liquid nitrogen pipes and controls liquid nitrogen flow, and contact thermocouple, the contact thermocouple are equipped in the mold
It is connected with temperature controller by compensating wire, the temperature controller is electrically connected with low temperature control valve and conveys direct current to low temperature control valve
Control signal.
Further, the die-cushion is exported equipped with proximate matter, and work band, the work band and proximate matter are equipped in the mold
Export coaxially arranged, the die-cushion contacts mold and the one side close to proximate matter outlet is equipped with liquid nitrogen channel loop, and the liquid nitrogen is logical
Road circuit is connected to liquid nitrogen pipes.
Further, the liquid nitrogen channel loop is equipped with liquid nitrogen entrance and liquid nitrogen exports, the liquid nitrogen outlet and proximate matter
Outlet, the liquid nitrogen entrance are connected to liquid nitrogen pipes.
Further, the section of the liquid nitrogen channel loop is semicircular structure, and is arranged around liquid nitrogen entrance.
Further, the contact thermocouple is mounted on the periphery in mold and positioned at work band.
The present invention also proposes a kind of method accurately controlling aluminium section hot-extrusion die local temperature, and specific step is such as
Under：During aluminum profile hot-extrusion, using low temperature liquid nitrogen as cooling medium to carrying out the mold of squeeze job into
Row Local cooling, the contact thermocouple in mold carry out Measurement die temperature, and by temperature controller according to preset mold
Invalid temperature control the output phase answers the direct current signal of voltage value or current value, and signal is passed to low temperature control valve, comes according to this
Control and the aperture for adjusting low temperature control valve, realize the control of liquid nitrogen flow in liquid nitrogen pipes, and then realize and accurately control mold
Temperature near interior work band；When the mold temperature that contact thermocouple measures has reached preset mould invalidation temperature, by
The voltage value or current value that temperature controller increase exports give low temperature control valve, to increase the aperture of low temperature control valve, realize liquid nitrogen
The increase of liquid nitrogen flow in pipeline realizes that the cooling of mold avoids mould invalidation, when the mold temperature that contact thermocouple measures
Not up to preset mould invalidation temperature when, the voltage value that export is reduced by temperature controller or current value gives low temperature control valve, thus
Reduce the aperture of low temperature control valve, realizes the reduction of liquid nitrogen flow in liquid nitrogen pipes, realize that the temperature plateau of mold is reduced to just
Constant value.
After adopting the above technical scheme, the invention has the advantages that：
1, by the installation mold in die-cushion, and contact thermocouple is mounted in mold, passes through contact thermocouple
It realizes the direct measurement to mold temperature, and temperature controller is passed to by the mold temperature information of measurement, temperature controller is according to default
Mould invalidation temperature control the output phase answer the direct current signal of voltage value or current value, and signal is passed into low temperature control valve,
It controls and adjusts the aperture of low temperature control valve according to this, realize the control of liquid nitrogen flow in liquid nitrogen pipes, and then realize accurate control
The temperature of molding jig overcomes the variation hysteresis quality of press exit proximate matter high temperature and mold temperature in aluminium extrusion process and differs
Secondly cause property accurately controls liquid nitrogen flow in mold liquid nitrogen cooling procedure by valve opening, and by contact thermocouple and
When feed back liquid nitrogen flow control valve, avoid in the prior art by infrared rays survey Surface of profile temperature scenario it is intrinsic between
The shortcomings of connecing thermometric and temperature change response lag causes extrusion process unqualified to prevent mold from cooling down transition by liquid nitrogen
Even directly squeeze the problems such as motionless.
2, by the way that liquid nitrogen channel loop is arranged in the one side that die-cushion contacts mold and exported close to proximate matter, liquid nitrogen is realized
Liquid nitrogen on channel loop can accurately control temperature at the work band of mold, extend die life and reduction to the maximum extent
The dosage of liquid nitrogen.
3, liquid nitrogen is delivered to liquid nitrogen entrance by liquid nitrogen pipes by liquid nitrogen container, and liquid nitrogen channel is entered by liquid nitrogen entrance
Circuit, which is realized, cools down to mold, and the liquid nitrogen of low temperature can be also evaporated to inertia protective effect at once while being cooled down to mold
Nitrogen, nitrogen can empty the oxygen in mould outlet space, i.e., form nitrogen blanket in proximate matter exit, protect mold
With Surface of profile not by high-temperature air oxidation.
4, it by making the section of liquid nitrogen channel loop be semicircular structure, and is arranged around liquid nitrogen entrance, realizes liquid nitrogen pair
The efficient cooling of mold, reduces the dosage of liquid nitrogen.
5, by the way that contact thermocouple to be mounted on to the periphery in mold and positioned at work band, the work to mold may be implemented
Work extends die life with relatively accurately controlling for temperature and reduces the dosage of liquid nitrogen to the maximum extent.
6, Local cooling is carried out to the mold for carrying out squeeze job as cooling medium using low temperature liquid nitrogen, be mounted on
Contact thermocouple in mold carrys out Measurement die temperature, realizes the direct measurement to mold temperature, overcomes in aluminium extrusion process
The variation hysteresis quality and inconsistency of press exit proximate matter high temperature and mold temperature, and lost according to preset mold by temperature controller
Effect temperature control the output phase answers the direct current signal of voltage value or current value, and signal is passed to low temperature control valve, controls according to this
System and the aperture for adjusting low temperature control valve, realize the control of liquid nitrogen flow in liquid nitrogen pipes, and then realize and accurately control in mold
Work is with neighbouring temperature, to make mold temperature control in the preferred range.
Description of the drawings
The invention will be further described below in conjunction with the accompanying drawings：
Fig. 1 is a kind of device accurately controlling aluminium section hot-extrusion die local temperature that the embodiment of the present invention one proposes
Structural schematic diagram；
Fig. 2 is in a kind of device accurately controlling aluminium section hot-extrusion die local temperature that the embodiment of the present invention one proposes
The structural schematic diagram of contact thermocouple and the band that works；
Fig. 3 is the sectional view in the faces a-a in Fig. 2；
Marked the names of the parts are as follows in figure：
1- liquid nitrogen containers, 2- low temperature control valves, 3- liquid nitrogen pipes, 4- die-cushions, 5- molds, 6- contact thermocouples, 7- temperature controls
Instrument, the outlet of 41- liquid nitrogen, the outlet of 42- proximate matters, 43- liquid nitrogen entrances, 44- liquid nitrogen channel loops, 51- work bands.
Specific implementation mode
The invention will be further described in the following with reference to the drawings and specific embodiments.It is to be appreciated that following "upper",
Indicating positions or the position such as "lower", "left", "right", " longitudinal direction ", " transverse direction ", "inner", "outside", "vertical", "horizontal", "top", "bottom"
The word for setting relationship is based only upon orientation or positional relationship shown in the drawings, only for the purposes of the description present invention and simplifies description, and
It is not instruction or implies that signified device/element must have a particular orientation or with specific azimuth configuration and operation, therefore
It is not considered as limiting the invention.
Embodiment one
As shown in Figs. 1-3, the present invention provides a kind of device accurately controlling aluminium section hot-extrusion die local temperature, including
Liquid nitrogen container 1, low temperature control valve 2, liquid nitrogen pipes 3, die-cushion 4, mold 5 and temperature controller 7, mold 5 are mounted in die-cushion 4, liquid nitrogen pipe
Road 3 is connected between liquid nitrogen container 1 and die-cushion 4 and for conveying liquid nitrogen into die-cushion 4, and low temperature control valve 2 is set in liquid nitrogen pipes 3
And liquid nitrogen flow is controlled, contact thermocouple 6 is equipped in mold 5, contact thermocouple 6 is connected with temperature controller by compensating wire
7, temperature controller 7, which is electrically connected with low temperature control valve 2 and conveys direct current to low temperature control valve 2, controls signal.Pass through the peace in die-cushion 4
Die-filling tool 5, and contact thermocouple 6 is mounted in mold, it is realized to the direct of 5 temperature of mold by contact thermocouple 6
It measures, and temperature controller 7 is passed to by the mold temperature information of measurement, temperature controller controls defeated according to preset mould invalidation temperature
Go out the direct current signal of relevant voltage value or current value, and signal is passed into low temperature control valve 2, controls and adjust low temperature according to this
The aperture of control valve 2 realizes the control of liquid nitrogen flow in liquid nitrogen pipes 3, and then realizes the temperature for accurately controlling mold, overcomes
The variation hysteresis quality and inconsistency of press exit proximate matter high temperature and mold temperature in aluminium extrusion process, secondly, mold liquid nitrogen
Liquid nitrogen flow is accurately controlled by valve opening in cooling procedure, and liquid nitrogen flow control is timely feedbacked by contact thermocouple
Valve, avoid in the prior art by infrared rays survey Surface of profile temperature scenario intrinsic indirect thermometric and temperature change ring
The shortcomings of should lagging, to prevent mold from causing extrusion process unqualified by liquid nitrogen cooling transition or even directly squeeze motionless etc. ask
Topic.
In the present embodiment, die-cushion 4 is equipped with proximate matter and exports 42, and work band 51 is equipped in the mold 5, and work 51 He of band
Proximate matter outlet 42 is coaxially arranged, and die-cushion 4 contacts mold 5 and the one side close to proximate matter outlet 42 is equipped with liquid nitrogen channel loop 44, liquid
Nitrogen channel loop 44 is connected to liquid nitrogen pipes 3.Mold 5 is contacted by the way that liquid nitrogen channel loop 44 is arranged in die-cushion 4 and by plesiotype
The one side of material outlet 42, temperature at the work band 51 of mold can be accurately controlled by realizing the liquid nitrogen on liquid nitrogen channel loop 44,
Die life is extended to the maximum extent and reduces the dosage of liquid nitrogen.
In the present embodiment, liquid nitrogen channel loop 44 be equipped with liquid nitrogen entrance 43 and liquid nitrogen outlet 41, liquid nitrogen outlet 41 with
42 connection of proximate matter outlet, the liquid nitrogen entrance 43 are connected to liquid nitrogen pipes 3.Liquid nitrogen is conveyed by liquid nitrogen pipes 3 by liquid nitrogen container 1
To liquid nitrogen entrance 43, and the realization of liquid nitrogen channel loop 44 is entered by liquid nitrogen entrance 43 and is cooled down to mold 5, the liquid nitrogen of low temperature is right
Mold can also be evaporated to the nitrogen with inertia protective effect at once while cooling, and nitrogen can empty in mould outlet space
Oxygen, i.e., proximate matter outlet 42 at formed nitrogen blanket, protect mold and Surface of profile not by high-temperature air oxidation.
In the present embodiment, the section of liquid nitrogen channel loop 44 is semicircular structure, and is arranged around liquid nitrogen entrance 43.It is logical
Crossing makes the section of liquid nitrogen channel loop 44 be semicircular structure, and is arranged around liquid nitrogen entrance 43, realizes height of the liquid nitrogen to mold
Effect cooling, reduces the dosage of liquid nitrogen.
In the present embodiment, contact thermocouple 6 is mounted on the periphery in mold 5 and positioned at work band 51.By that will connect
Touch thermocouple 6 be mounted on mold 5 in and positioned at work band 51 periphery, may be implemented to mold work 51 temperature of band compared with
It accurately controls and extends die life to the maximum extent and reduce the dosage of liquid nitrogen.
The embodiment of the present invention one also proposes a kind of method accurately controlling aluminium section hot-extrusion die local temperature, specifically
Steps are as follows：During aluminum profile hot-extrusion, using low temperature liquid nitrogen as cooling medium to carrying out squeeze job
Mold 5 carries out Local cooling, and the contact thermocouple 6 in mold 5 carrys out 5 temperature of Measurement die, and by 7 basis of temperature controller
Preset mould invalidation temperature control the output phase answers the direct current signal of voltage value or current value, and signal is passed to low temperature control
Valve 2 controls and adjusts the aperture of low temperature control valve 2 according to this, realizes the control of liquid nitrogen flow in liquid nitrogen pipes 3, and then realize
It accurately controls in mold and works with neighbouring temperature；When 5 temperature of mold that contact thermocouple 6 measures has reached preset mold
When invalid temperature, the voltage value or current value exported by the increase of temperature controller 7 is to low temperature control valve 2, to increase low temperature control valve 2
Aperture, realize liquid nitrogen pipes 3 in liquid nitrogen flow increase, realize that the cooling of mold avoids mould invalidation, when contact thermoelectricity
When even 65 temperature of mold measured are not up to preset mould invalidation temperature, reduce the voltage value or electric current of output by temperature controller 7
It is worth to low temperature control valve 2, to reduce the aperture of low temperature control valve 2, realizes the reduction of liquid nitrogen flow in liquid nitrogen pipes 3, realize
The temperature plateau of mold is reduced to normal value.
It is understood that the aluminium section die smaller for squeezing wall thickness, contact thermocouple 6 can be mounted on mold
Work 51 near zone of band, to be more accurately controlled liquid nitrogen flow, it is ensured that mold temperature is not less than 420 DEG C, to prevent because of mistake
Degree cooling causes to squeeze bored vehicle.
It is understood that for mold 5 (lower die of flat-die or diffluence combination die) and be introduced directly into liquid nitrogen die-cushion 4 it
Between there is the case where transitional die-cushion, then liquid nitrogen circuit should be placed on transition die-cushion, i.e., liquid nitrogen cooling circuit should be made to lean on as possible
Near-lying mode has, and can make its dosage that is more direct to the temperature control of mold, effective and can preferably saving liquid nitrogen in this way.
It should be noted that herein, relational terms such as first and second and the like are used merely to an entity
Or operation distinguished with another entity, without necessarily requiring or implying between these entities or operation there are it is any this
Either sequence and the terms "include", "comprise" or its any other variant are intended to nonexcludability to the actual relationship of kind
Include so that including a series of elements process, method, article or equipment not only include which element, but also
Including other elements that are not explicitly listed, or further include for this process, method, article or equipment intrinsic want
Element.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
Understand in the case that do not depart from the present invention spirit and can make to these embodiments carry out it is a variety of variation, modification, replace and
Deformation, the scope of the present invention are limited by the following claims and their equivalents matter.
Claims (6)
1. a kind of device accurately controlling aluminium section hot-extrusion die local temperature, including liquid nitrogen container, low temperature control valve, liquid nitrogen pipe
Road, die-cushion, mold and temperature controller, the mold are mounted in die-cushion, which is characterized in that the liquid nitrogen pipes are connected to liquid nitrogen container
Between die-cushion and for conveying liquid nitrogen into die-cushion, the low temperature control valve is set in liquid nitrogen pipes and controls liquid nitrogen flow,
Contact thermocouple is equipped in the mold, the contact thermocouple is connected with temperature controller, the temperature control by compensating wire
Instrument is electrically connected with low temperature control valve and controls signal to low temperature control valve conveying direct current.
2. the device according to claim 1 for accurately controlling aluminium section hot-extrusion die local temperature, which is characterized in that institute
It states die-cushion to export equipped with proximate matter, work band is equipped in the mold, the work band and proximate matter export coaxially arranged, the mould
The one side that pad contact mold and close proximate matter export is equipped with liquid nitrogen channel loop, and the liquid nitrogen channel loop connects with liquid nitrogen pipes
It is logical.
3. the device according to claim 2 for accurately controlling aluminium section hot-extrusion die local temperature, which is characterized in that institute
It states liquid nitrogen channel loop to export equipped with liquid nitrogen entrance and liquid nitrogen, the liquid nitrogen outlet and proximate matter outlet, the liquid nitrogen enter
Mouth is connected to liquid nitrogen pipes.
4. the device according to claim 2 for accurately controlling aluminium section hot-extrusion die local temperature, which is characterized in that institute
The section for stating liquid nitrogen channel loop is semicircular structure, and is arranged around liquid nitrogen entrance.
5. the device according to claim 1 for accurately controlling aluminium section hot-extrusion die local temperature, which is characterized in that institute
State periphery of the contact thermocouple in mold and positioned at work band.
6. a kind of method that aluminium section hot-extrusion die local temperature is accurately controlled according to claim 1-5 any one of them,
It is characterized in that, specific steps are as follows：During aluminum profile hot-extrusion, using low temperature liquid nitrogen as cooling medium to just
Local cooling is carried out in the mold for carrying out squeeze job, the contact thermocouple in mold carrys out Measurement die temperature, and
The output phase is controlled according to preset mould invalidation temperature by temperature controller and answers the direct current signal of voltage value or current value, and signal is passed
Low temperature control valve is passed, controls and adjusts the aperture of low temperature control valve according to this, realize the control of liquid nitrogen flow in liquid nitrogen pipes,
And then it realizes to accurately control in mold and work with neighbouring temperature；When the mold temperature that contact thermocouple measures has reached default
Mould invalidation temperature when, low temperature control valve is given by the temperature controller voltage value that exports of increase or current value, to increase low temperature control
The aperture of valve processed realizes the increase of liquid nitrogen flow in liquid nitrogen pipes, realizes that the cooling of mold avoids mould invalidation, when contact heat
When the mold temperature that galvanic couple measures is not up to preset mould invalidation temperature, reduce the voltage value or current value of output by temperature controller
Low temperature control valve is given, to reduce the aperture of low temperature control valve, the reduction of liquid nitrogen flow in liquid nitrogen pipes is realized, realizes mold
Temperature plateau is reduced to normal value.
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| CN201810495065.6A CN108500076A (en) | 2018-05-22 | 2018-05-22 | A kind of device and method accurately controlling aluminium section hot-extrusion die local temperature |
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| CN201810495065.6A CN108500076A (en) | 2018-05-22 | 2018-05-22 | A kind of device and method accurately controlling aluminium section hot-extrusion die local temperature |
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Cited By (5)
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| CN109387301A (en) * | 2018-11-06 | 2019-02-26 | 广西平果百矿高新铝业有限公司 | A kind of long distance temperature measurement method of material |
| CN111375647A (en) * | 2020-05-20 | 2020-07-07 | 西南铝业（集团）有限责任公司 | Extrusion die cooling system |
| CN113695414A (en) * | 2021-08-30 | 2021-11-26 | 昆山陆新新材料科技有限公司 | Liquid nitrogen cooling process for extrusion die |
| CN114247767A (en) * | 2021-12-22 | 2022-03-29 | 古交市银河镁业有限公司 | Magnesium alloy cooling constant-speed extrusion device and method |
| CN114799057A (en) * | 2022-05-23 | 2022-07-29 | 南京航空航天大学 | Temperature feedback control device and method for numerical control forming of frozen sand mold |
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